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avcodec/pngdec: Check IHDR/IDAT order

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Fixes out of array access
Fixes: asan_heap-oob_20a6c26_2690_cov_3434532168_mail.png
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2014-11-26 15:45:47 +01:00
parent 8b8cb30d11
commit 79ceaf827b
1 changed files with 6 additions and 0 deletions
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6
libavcodec/pngdec.c
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@ -524,6 +524,12 @@ static int decode_ihdr_chunk(AVCodecContext *avctx, PNGDecContext *s,
{
if (length != 13)
return AVERROR_INVALIDDATA;
if (s->state & PNG_IDAT) {
av_log(avctx, AV_LOG_ERROR, "IHDR after IDAT\n");
return AVERROR_INVALIDDATA;
}
s->width = bytestream2_get_be32(&s->gb);
s->height = bytestream2_get_be32(&s->gb);
if (av_image_check_size(s->width, s->height, 0, avctx)) {